This employs high-pressure pumps to force the water from brine through a membrane that is impermeable to salt.

这种方法需要用高压泵使海水通过一种不能渗透盐的薄膜，从而淡化海水。

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Devising a suitable membrane-tough enough to withstand the pressure while remaining permeable to water but not to salt-is harder than it sounds.

设计一种适合的膜非常困难：一方面要足够坚韧，以承受压力；但同时还要有渗透性，而且只能透水，不能透盐。

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Multipass Internal Pressure Type Hollow Fiber Membrane is the best choice for purifying water.

多通道内压式中空纤维膜，洁净水处理的最佳选择。

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The salt of the seawater draws the fresh water across the membrane, leading to a build-up of pressure which forces water through the turbine, generating electricity.

FORBES: Getting Power From Salty Water